drm/omapdrm: drop fb_debug_enter/leave

This is a no-op on atomic drivers because with atomic it's simply too
complicated to get all the locking and workers and nonblocking
synchronization correct, from essentially an NMI context. Well, too
complicated = impossible. Also, omapdrm never implemented the
mode_set_base_atomic hook, so I kinda wonder why this was ever added.

Drop the hooks.

Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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